

The five eggs which still remain must be hatched at some point in the story. The captive Sea Emperor Leviathan is the last remaining adult of its species and a parent to at least seven eggs. It will also watch the player intently if they are near the Incubator Device or the aquarium Arch, quickly spinning around and coming to a rest on the aquarium's floor. Upon entering the aquarium, the Sea Emperor Leviathan will climb up onto a platform to observe and speak to the player, then descend back down.

After the player inserts an Ion Cube into the Incubator Device, the Sea Emperor Leviathan will speak to the player, and will move to the left side of the Alien Arch, and blow away the sand, uncovering the Arch that the player can use to access the Arch outside of the Quarantine Enforcement Platform. She will continue to interact with Rely upon entering the Aquarium, telling them what they need to do in order to hatch the eggs. She will contact the player again shortly after they have obtained the Blue Tablet, and again upon entering the Lava Lakes. She will first contact the player telepathically either sixty minutes after attempting to deactivate the Quarantine Enforcement Platform or twenty minutes after reaching the Disease Research Facility (whichever happens first).

Whenever she communicates with the player, the screen becomes distorted in a similar way to when a Warper teleports the player, or a Mesmer hypnotizes the player. When the Kharaa Bacterium was released onto the planet, many creatures died, destroying the food source of her species is capable of telepathic speech, which she uses to communicate with the player at various locations around the world. It's suggested that in the past these creatures would have traveled in small herds in the bottom of the trenches (that being the Crater Edge), occasionally coming to the surface to feast on the microorganisms in the shallower water. She also has a hole in the back with an unknown purpose, most likey for creating enzyme 42 or laying eggs.ĭespite her gargantuan size, her diet consists solely of micro-organisms filtered from the water, much like real-life Baleen whales and Blue whales. Unlike the Sea Dragon Leviathan, she doesn't have true graspers instead, its forelimbs are two massive, paddle-like arms, similar to some paddles used by turtles, primarily used for stabilization while swimming and possibly used for defense against predators. Her posterior consists of seven long, yet slim tentacles ending with large tentacular clubs, with the largest being in the center, surrounded by the six smaller tentacles. She has four binocular eyes, glowing cyan in color Her head is comparatively small, and quite peculiar in shape (see "Trivia" below for more), featuring two striped antennae with glowing green lures atop her snout, two large mandibles on each side of heer rather small mouth, and a glowing hollow between these mandibles. Its tentacles are adorned with bright cyan bioluminescent "bulbs."

She is colossal, having a stocky, entirely armored body and is predominantly pale brown in color, with shades of green. It is sapient and telepathic, but unlike most Leviathans, it is not aggressive. The Sea Emperor Leviathan is the largest of the living Leviathan class fauna found within the crater in Subnautica.
